Method of making swivel-joints.



No, 874,618. PATENTED DEG. 24,1907. A. 11. OSTER & MAIN. METHOD OFMAKING SWIVEL JOINTS.

APiL IOATION FILED M342, 1907.

Wihwaazo ARLIE n. oS'iER AND LAWRENCE MAIN, or OENTRALIA, WASHINGTON.

METHOD OF MAKING SWIVEL-JOINTS.

Specification of Letters Patent.

Patented Dec. 24, 1907'.

Application filed March 12. 1907. Serial No. 862,035.

To all whom "it may concern:

Be it known that we, ARLIE D. OSTER and L WRENCE MAIN, citizens of the AUnited States of America, residing at Centralia, in the county of Lewisand State of VVashington, have invented certain new and usefulImprovements in Methods of Making Swivel- Joints, of which the followingis a specification, reference being had therein to the ac companyingdrawing.

This invention relates to the method of making swivel-joints, especiallyto those used in cable and chain lines under tensile stress; and has forits objects to provide a swivel connection which will not become clampedunder tension, and to so simplify the method of making as to reduce thetime and cost of manufacture.

Our invention is illustrated in the accompanying drawing in which Figure1 is a section showing a completed swivel-connection between an eye anda hook, and Fig. 2 is a section of the binding ring, with two eye-piecestherein, before the ring has been forged to its finished shape.

Similar numerals of reference refer to similar parts throughout theseveral views.

Our invention consists in welding an eyepiece into a ring and thenforging the ring around the enlarged end of another eye-. piece, orhook, forming the swivel-part, and turning said swivel-part within theforged ring during the forging thereof. The swivelconnection thus madeis found in practice to overcome the principal objection found insimilar devices at the present time in that under tension it ispractically as free to turn as when relieved from tension. This isprobably due to the fact that we turn the swivel-part while the ring isstill sufficiently hot to be soft, and also to the chilling effect ofthe cold iron of the swivel part in contact with the hot ring thusmaking, when the connection is completed, a smooth hard surface on theinner side of the ring against ghich the enlargement of the swivel-partears.

The ring 1 is made of such size, in diameter and length, as to receivethe enlarged ends of the two links and to be forged around them ashereinafter described. The fixed link 2 will usually be constructed asan eye-piece and has its inner end 3 enlarged with inclined sides and iseither of circular or any other convenient cross-section. This link 2 isheated to a very high temperature at the same time that the ring isheated, and the end '4 of the ring is forged around it and welded to itso that the ring 1 and the link 2 become practically one body. Theswivellink 5 is formed with a ball-shaped, or other similarly shaped,enlargement 6 at its inner end, having a neck 7 between the outer partof the link and the inner enlargement 6. This link 5 is inserted intothe hot ring 1 and the end 8 of the ring is forged around the outer partof the enlargement 6, to the neck 7, and at the same time the link 5 isturned relatively to the ring 1. The outer part of the link 5 may beformed as an eye-piece, a hook, or any other suitable device.

Having now described our invention what we claim is 1' 1. The method ofmaking a swivel-connection consisting of welding a fixed link into theend of a ring, and forging the other end of the ring around the enlargedend of the swivel-link.

2. The method of making a swivel-connection consisting of welding afixed link into the end of a ring, forging the other end of the ringaround the enlarged end of the swivellink, and turning the swivel-linkrelatively to the ring during the forging of the ring therearound.

In testimony whereof we aiiiX our signatures in presence of twowitnesses.

ARLIE D. OSTER. LAI/VRENCE MAIN.

Witnesses:

F. WV. THOMAS, C. G. INeALLs.

